Alright, the 4 x 15 isn't difficult. That's 60. The easiest way for me to get 3/4 of anything, is to put it in decimal form, and multiply your number by that. 3/4 can be expressed in decimal form as .75, so if you can't see what 3/4 of 4 is in your head, then just multiply 4 by .75 in a calculator. Then add it to 60, and there's your answer. (: